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105=-u+198
We move all terms to the left:
105-(-u+198)=0
We add all the numbers together, and all the variables
-(-1u+198)+105=0
We get rid of parentheses
1u-198+105=0
We add all the numbers together, and all the variables
u-93=0
We move all terms containing u to the left, all other terms to the right
u=93
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